> > Pages 2 & 3 explain how the system uses two palettes -
> > one for colours that can be drawn on and those that can't
>
> Jinx,
>
> I read those pages.  :-)
>
> The thing is, both of those palettes are derived from the *same*
> image.  How can you tell the player's green shirt from the green
> grass, if they're _exactly_ the same color?  I can only think of
> two possible solutions to this problem:
>
> 1.  The teams are told not to wear green uniforms, or to use a
> shade of green different from the color of the grass

In the early days of blue screen / green screen masking I think
that would have been true, but now the s/w and h/w is very good
at picking out hues. The h/w must be keeping track of object
boundaries too. As it says at HSW, the picture is analysed 60
times per second by some powerful processors. Look at the
level of sophistication of a Silicon Graphics workstation. Firms
like LucasArts are dedicated to making CGI h/w with some
serious smarts. If you've seen Lord Of The Rings you'd have
to be impressed by the newest CGI FX

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